Malicious PDF — malware analysis report

Static analysis result for SHA-256 852ca8d08d6f596c…

MALICIOUS

PDF

76.1 KB Created: 2021-08-22 01:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3b56d227ec34cfbbf6ed8801b3161ef SHA-1: 266781fe0190f86365535fa0215ec44513c6b6c4 SHA-256: 852ca8d08d6f596c9d2d2c37a0668fa497ad41a567e00bb73902016764da1405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=honey+select+saw+hair+pack+350+by+hello+santa PDF link annotation
    • http://esllearningbydesign.com/app/webroot/files/file/puzojapa.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fubopazuniduzapuro.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/lanux.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/gikivafupoxogafok.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021881530376891.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/67255214908.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f5e04f69516f8ecfcb13aecfc2d9172a/20332697288.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993a530e53a---fedojudepozetidubukunivi.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/fuzew.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/97807430429.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/donuwegixunir.pdfIn PDF document text
    • http://meskerjager.nl/media/files/kagoxuzogowiwif.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/4ff29572f172019e04f1c4390b623e48/28383722984.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef681f166---jimegabotogisajevuwidaza.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/55383757893.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/67218705601.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c4d52f056572c0f2a85c04fa69ecb93/38767963481.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/daxekebexegunufara.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608292a74ef53---sofefosafuvikojekiw.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/33550804257.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kexetisagezoxenoselizokif.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73859740570.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E5 11324 bytes
SHA-256: e34560432bbe06b8c564c971770b2ba411246a17df1dec77c8dc6b41f83e7b18
font_01_sfnt_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 16632 bytes
SHA-256: 1baad03987513ff5062e5f8e8e6abda853e713fc663976f8ed2ba06e6d31b274
font_02_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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